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2 Experiences of Interim CBB Arrangements  More discrete pricing (6 prices) has allowed more cost reflective pricing  Useful for offsetting longer runs on expensive GB BMUs particularly over demand peaks  Cannot readily use for GB energy balancing as not fully integrated into dispatch tools  Active constraints on GB system potentially exacerbated  Flexibility of product i.e. windows currently allow for longer duration product and also for product shaping  NGET and RTE can indicate requirements ahead of gate closure through Early Notification Process  Greater refinement could be delivered with more pricing periods e.g. across current periods often selling and buying in different hours within the window

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11 NGET Proposes a 2-Hour Product  In addition to 1-hour products  A 2-hour CBB product would mitigate many of the identified risks.  Overcomes the major risk of failing to secure a second hourly product on demand peaks  Reduces uncertainty associated with potential system events and secures additional time to put alternatives in place if required  Helps preserve critical STOR (short notice / short duration plant e.g. OCGTs  Can also be used to resolve ‘ramp management’ issues as part of an integral energy/system transaction

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12 Common NGET / RTE Working Programme  Revision of the target date for enduring solution to November 2010  NGET and RTE work together to analyse in depth the possibility to secure a 2-hour product Target : conclusion by February 2010 Whether a solution is found, costs and planning re-evaluation will allow to define a target date for implementation, as far as possible implemented simultaneously with go-live  Both Operators are today working towards the implementation of the enduring solution for UK-FR CBB solution Target Go live : achieving go-live in November 2010 On the basis of the one hour duration product and the already agreed adaptations, augmented with the result of the study when available